An Outpost of Progress
MLA
Conrad, Joseph, 1857-1924. An Outpost of Progress. Box 16. 1896 July. https://collections.library.yale.edu/catalog/2044298.
APA, 6th edition
Conrad, Joseph, 1857-1924. (["Box 16"])(1896 July)[An Outpost of Progress]. https://collections.library.yale.edu/catalog/2044298.